Table 1.
Chemical characterization of CGC hydrogels obtained by different number of freeze–thaw cycles: 1 cycle (Na51 hydrogel), 2 cycles (Na52 hydrogel), 3 cycles (Na53 hydrogel) and 1 cycle with reduced freezing time (Na51* hydrogel); n.a., data not available.
| Samples | Na51 | Na52 | Na53 | Na51* | Na5 [22] |
|---|---|---|---|---|---|
| No. of cycles | 1 | 2 | 3 | 1 | 4 |
| Freezing time (h) | 48 | 48 | 48 | 18 | 48 |
| Polymer content (wt%) | 1.68 ± 0.17 | 1.58 ± 0.04 | 1.42 ± 0.02 | 1.66 ± 0.11 | 2.28 |
| Water content (wt%) | 98.22 ± 0.20 | 98.45 ± 0.06 | 98.58 ± 0.02 | 97.63 ± 0.12 | 97.72 |
| Chitin content (%) | 25.63 ± 0.78 | 24.71 ± 2.98 | 23.85 ± 0.14 | 21.51 ± 1.49 | n.a. |